CN104090386A - Method for regulating light field polarization state distribution - Google Patents
Method for regulating light field polarization state distribution Download PDFInfo
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- CN104090386A CN104090386A CN201410370753.1A CN201410370753A CN104090386A CN 104090386 A CN104090386 A CN 104090386A CN 201410370753 A CN201410370753 A CN 201410370753A CN 104090386 A CN104090386 A CN 104090386A
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Abstract
The invention discloses a method for regulating light field polarization state distribution. The method relates to a laser alignment and beam expanding system, a special shape vector light field generation system and a focusing and detecting system. The method includes the steps that a vector light field is generated by a hologram, the hologram is controlled by a computer, phase modulation information and shape modulation information are loaded, the hologram is projected to a space photoconverter, and the vector light field special in shape is generated. A focus field with the controllable polarization state distribution can be obtained at the position of a focal point through focusing. By means of the method, after the incidence vector light field with local linear polarization distribution is focused, a focal field, with hybridization distribution with linear polarization, circular polarization and elliptic polarization at the same time, on a focal plane is obtained. The shape of the incidence vector light field is changed, and the focal field with any polarization state distribution can be obtained. Compared with other common light field modulation methods, the method has the advantages that the polarization states of points can be accurately regulated; meanwhile, the method has the advantages that the light path is simple, the technology is mature, and the stability is high.
Description
Technical field
The present invention relates to light field polarization state distribution field, be specifically related to a kind of method that light field polarization state distributes that regulates and controls.
Background technology
Polarization, as one of light field basic and important attribute, plays very important effect in light-matter interaction.Conventionally in the lateral cross section of light field, polarization state is equally distributed, as linearly polarized light, circularly polarized light and elliptically polarized light.Nearly ten years, along with the maturation gradually of micro-nano technology of preparing and day by day enriching of light field control technique, researcher has generated a kind of special light field of polarization state non-uniform Distribution on its light field cross section, be referred to as vectorial field [Q.Zhan, " Cylindrical vector beams:from mathematical concepts to applications; " Adv.Opt.Photon.1,1-57 (2009)].
Along with to the deepening continuously of vectorial field research, people's broad research the generation method of vectorial field, propagation characteristic, a burnt engineering, technology application.Vectorial field is applied to receiving the every field such as photonics, quantum optics, nonlinear optics, atom optics.Why vectorial field has so how special character and application, is because its special polarization state distributes to a great extent.Unique polarization state is distributed in the aspects such as optics trapping, the micro-processing of optics, optical micro-manipulation and has demonstrated wide application.
For polarization state regulation researcher, the whole bag of tricks has been proposed [as X.L.Wang et.al. in recent years, " Unveiling locally linearly polarized vector fields with broken axial symmetry; " Phys.Rev.A 83,063813 (2011); H.Chen et.al., " Separation of spin angular momentum in space-variant linearly polarized beam, " Appl.Phys.B 114,355-359 (2014)].Yet these methods, need complicated light path and a large amount of optical elements mostly, have greatly reduced operability, affected the effect of regulation and control.
Design a kind of simple regulate and control method, become the direction of prior art development.
Summary of the invention
Goal of the invention: in order to solve the regulate and control method light path complexity of light field polarization state in prior art, the problem that optical device is numerous, the invention provides a kind of method that light field polarization state distributes that regulates and controls, by simple light path and device, light field polarization state is regulated and controled, solved the deficiencies in the prior art.
Technical scheme: a kind ofly regulate and control the method that light field polarization state distributes, it is characterized in that, comprise one group of lens, spatial light modulator, controller, wave plate, grating, laser beam analyzer and controller;
One group of lens comprises concavees lens, preposition convex lens and rearmounted convex lens;
When incoming laser beam passes through concavees lens and convex lens successively, collimator and extender becomes linearly polarized light beam, and this linearly polarized light beam is incident to spatial light converter; Controller is projection hologram on spatial light converter, and described hologram adds and carries phase information and shape information; Spatial light converter is loaded into above information on light beam; By the linearly polarized light beam after spatial light converter, successively by wave plate and grating, generate vectorial field, this vectorial field is local linear polarization light field; This local linear polarization light field, through rearmounted convex lens focus, obtains the focusing light field that polarization state distributes arbitrarily; Defining this focusing light field is Jiao Chang, at Jiao Chang place, the polarization state of light field is regulated and controled; Laser beam analyzer is analyzed the light intensity at this light field focus place.
Concrete, the spot size of linearly polarized light beam mates with spatial light converter operation window.To generate high-quality special shape vector beam, improve the efficiency of light beam modulation.
Concrete, when the polarization state of light field is regulated and controled at Jiao Chang place, local linearly polarized light is converted into there is local linear polarization simultaneously, the hydridization polarized light field of circular polarization and elliptic polarization distribution.
Beneficial effect:
(1) the present invention distributes to polarization state, can obtain according to demand the focusing light field that polarization state distributes arbitrarily.By careful design and adjusting, can accomplish accurate control to the polarization state of each point;
(2) the present invention only need change the shape of vectorial field, just can reach at lens focal plane place the effect of regulation and control polarization state, simple to operate, is also beneficial to light field integrated;
(3) the present invention is applicable to the vectorial field that random polarization state distributes, and has wide range of applications;
(4) the present invention only need load shape information to the hologram of spatial light modulator institute projection, without tediously long step and complicated light path.Technology maturation, step is simple, and stability is strong.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representation
Fig. 2 is special shape vector field plot of light intensity of the present invention
Fig. 3 is the light intensity at focus of the present invention place and the light intensity at process different orientation polaroid back focus place
Fig. 4 is the distribution plan of the polarization state at place, focal plane of the present invention
Embodiment
Below in conjunction with accompanying drawing, the present invention is done further and explained.
Regulate and control the method that light field polarization state distributes, it is characterized in that, comprise one group of lens, spatial light modulator 4, controller 5, wave plate 6, grating 7, laser beam analyzer 9 and controller 5;
One group of lens comprises concavees lens 2, preposition convex lens 3 and rearmounted convex lens 8;
When incoming laser beam 1 passes through concavees lens 2 and convex lens 3 successively, collimator and extender becomes linearly polarized light beam, and this linearly polarized light beam is incident to spatial light converter 4; Controller 5 is projection hologram on spatial light converter 4, and described hologram adds and carries phase information and shape information; Spatial light converter 4 is loaded into above information on light beam; The spot size of described linearly polarized light beam mates with spatial light converter 4 operation windows.By the linearly polarized light beam after spatial light converter 4, successively by wave plate 6 and grating 7, generate vectorial field, this vectorial field is local linear polarization light field; This local linear polarization light field focuses on through rearmounted convex lens 8, obtains the focusing light field that polarization state distributes arbitrarily; Defining this focusing light field is Jiao Chang, and Jiao Chang refers to the light field at focus place, focuses on light field.At Jiao Chang place, the polarization state of light field is regulated and controled, local linearly polarized light is converted into there is local linear polarization simultaneously, hydridization polarized light field that circular polarization and elliptic polarization distribute.Laser beam analyzer 9 is analyzed the light intensity at this focus place, Jiao field.
Embodiment mono-:
As shown in Figure 1, experimental provision can be divided into beam-expanding collimation system, special shape vectorial field generation system, focuses on and three parts of detection system.Beam-expanding system is comprised of concavees lens 2 and preposition convex lens 3; Special shape vectorial field generation system is comprised of spatial light converter 4, computing machine 5, wave plate 6 and grating 7; Focusing and detection system are comprised of rearmounted convex lens 8 and laser beam analyzer 9.From the laser beam of laser instrument output, through lens combination, expand into high-quality linearly polarized light beam, be incident to spatial light converter.On spatial light converter, the hologram that uses computer control software to generate in projection, adds the phase information and the shape information that carry Laser Modulation on hologram, and light beam can be loaded into these information on light beam when through spatial light converter.Transmitted light beam passes through wave plate and grating again, generates the vectorial field of special shape, and the polarization state of this vectorial field is local linear polarization light field, and namely on light field cross section, the polarization state at each point place possibility direction is different, but each point place is all linear polarization.Local linearly polarized light refers to by the vectorial field of the rear generations such as spatial light converter, wave plate, grating and hologram.Afterwards, this local polarized light field, by focusing system, completes the regulation and control that polarization state is distributed at lens focal plane place.According to above step, local linear polarization light field originally can be converted into the hydridization polarization vector light field simultaneously with linear polarization, circular polarization and elliptic polarization.As required, can, by the shape of cutting vectorial field, obtain the Jiao Chang that polarization state distributes arbitrarily.
Through said process, the light field obtaining can be monitored with laser beam analyzer.Fig. 2 and Fig. 3 are the plot of light intensity of recording, the special shape vector field of Fig. 2 for generating, and Fig. 3 is respectively total plot of light intensity at place, focal plane and through 0 ° from left to right, 45 °, 90 °, the plot of light intensity after the linear polarizer that 135 ° of directions are placed.As can be seen from the figure, the light field at focus place presents a kind of special shape of flat inclination.The more important thing is, by four burnt plot of light intensity through polaroid in Fig. 3, can find out, after linear polarizer, the delustring of light field is not common fan-shaped delustring, but irregular complicated delustring, this has confirmed that complicated variation has occurred the polarization state of Jiao Chang, by original local linear polarization light field, has changed hydridization polarized light field into.
In Fig. 4, be respectively the distribution plan of the polarization state that drawn by numerical evaluation, shown that the polarization state at focus place distributes in figure, in figure, solid mark represents dextrorotation, and hollow mark represents left-handed, and linear mark represents linear polarization.By relatively finding out, polarization state shown in Fig. 4 distributes, consistent with the experimental result in Fig. 2, local linearly polarized light at lens focal plane place, be converted into there is local linear polarization simultaneously, hydridization polarized light field that circular polarization and elliptic polarization distribute, illustrate that the present invention can carry out polarization state regulation accurately and effectively.The result of regulation and control gained is that the shape by the linear polarization vectorial field generating determines, by loading the shape modulation information of light field, controls the shape of light field, just can reach the object that regulates the distribution of light field polarization state.Can find out, by changing light field shape, regulate and control the method that polarization state distributes, light path is simple, easy to operate, and regulating effect is good, and method stability is strong.
In this example, preferably laser beam is single longitudinal mode 532nm continuous light; Three focal lengths of lens are respectively: concavees lens 2 are-50mm; Preposition convex lens 3 are 400mm; Rearmounted convex lens 8 are 150mm; Laser beam analyser (Beamview, Coherent Inc.).
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. regulate and control the method that light field polarization state distributes, it is characterized in that, comprise one group of lens, spatial light modulator (4), controller (5), wave plate (6), grating (7), laser beam analyzer (9) and controller (5);
One group of lens comprises concavees lens (2), preposition convex lens (3) and rearmounted convex lens (8);
When incoming laser beam (1) passes through concavees lens (2) and convex lens (3) successively, collimator and extender becomes linearly polarized light beam, and this linearly polarized light beam is incident to spatial light converter (4); Controller (5) is at the upper projection hologram of spatial light converter (4), and described hologram adds and carries phase information and shape information; Spatial light converter (4) is loaded into above information on light beam; By the linearly polarized light beam after spatial light converter (4), successively by wave plate (6) and grating (7), generate vectorial field, this vectorial field is local linear polarization light field; This local linear polarization light field focuses on through rearmounted convex lens (8), obtains the focusing light field that polarization state distributes arbitrarily; Defining this focusing light field is Jiao Chang, at Jiao Chang place, the polarization state of light field is regulated and controled; Laser beam analyzer (9) is analyzed the light intensity at this focus place, Jiao field.
2. a kind ofly as claimed in claim 1 regulate and control the method that light field polarization state distributes, it is characterized in that: the spot size of described linearly polarized light beam mates with spatial light converter (4) operation window.
3. a kind ofly as claimed in claim 1 regulate and control the method that light field polarization state distributes, it is characterized in that: when the polarization state of light field is regulated and controled at Jiao Chang place, local linearly polarized light is converted into there is local linear polarization simultaneously, hydridization polarized light field that circular polarization and elliptic polarization distribute.
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Cited By (11)
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| CN104777625A (en) * | 2015-04-21 | 2015-07-15 | 东南大学 | Device for generating elliptical polarization vector light field |
| CN105182547A (en) * | 2015-10-19 | 2015-12-23 | 山东师范大学 | Method and device using birefraction polarization beam splitter to generate vector beam |
| CN106094235A (en) * | 2016-08-10 | 2016-11-09 | 东南大学 | A kind of device utilizing uniaxial crystal to realize the rotation of light field polarization state |
| CN107146649A (en) * | 2017-06-06 | 2017-09-08 | 东南大学 | A kind of apparatus and method for manipulating low refractive index dielectric nano-particle |
| CN107402454A (en) * | 2017-08-31 | 2017-11-28 | 东南大学 | The non-linear ellipse inclined rotating device of radial variations is realized based on elliptical polarization vectorial field |
| CN109241682A (en) * | 2018-10-31 | 2019-01-18 | 暨南大学 | A kind of production method of the arbitrary orientation magnetizing field based on electric dipole radiation patterns |
| CN109283673A (en) * | 2018-09-18 | 2019-01-29 | 东南大学 | It is a kind of to realize the three-dimensional controllable device and method of optics coke field spin direction |
| CN110515216A (en) * | 2019-07-19 | 2019-11-29 | 四川大学 | It a kind of light intensity and polarizes atwirl light field and regulates and controls method |
| CN113552718A (en) * | 2021-07-26 | 2021-10-26 | 南开大学 | Micro-nano structure processing method and system |
| CN113960813A (en) * | 2021-12-22 | 2022-01-21 | 苏州大学 | High-order poincare sphere polarization state generation method and system with robustness |
| CN114839788A (en) * | 2022-05-07 | 2022-08-02 | 浙江理工大学 | Light field center polarization state is along with distance regulation and control system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777625A (en) * | 2015-04-21 | 2015-07-15 | 东南大学 | Device for generating elliptical polarization vector light field |
| CN105182547A (en) * | 2015-10-19 | 2015-12-23 | 山东师范大学 | Method and device using birefraction polarization beam splitter to generate vector beam |
| CN106094235A (en) * | 2016-08-10 | 2016-11-09 | 东南大学 | A kind of device utilizing uniaxial crystal to realize the rotation of light field polarization state |
| CN107146649A (en) * | 2017-06-06 | 2017-09-08 | 东南大学 | A kind of apparatus and method for manipulating low refractive index dielectric nano-particle |
| CN107146649B (en) * | 2017-06-06 | 2019-04-12 | 东南大学 | A kind of device and method manipulating low refractive index dielectric nanoparticle |
| CN107402454A (en) * | 2017-08-31 | 2017-11-28 | 东南大学 | The non-linear ellipse inclined rotating device of radial variations is realized based on elliptical polarization vectorial field |
| CN109283673A (en) * | 2018-09-18 | 2019-01-29 | 东南大学 | It is a kind of to realize the three-dimensional controllable device and method of optics coke field spin direction |
| CN109241682A (en) * | 2018-10-31 | 2019-01-18 | 暨南大学 | A kind of production method of the arbitrary orientation magnetizing field based on electric dipole radiation patterns |
| CN109241682B (en) * | 2018-10-31 | 2023-01-31 | 暨南大学 | Method for generating arbitrarily oriented magnetization field based on electric dipole radiation model |
| CN110515216A (en) * | 2019-07-19 | 2019-11-29 | 四川大学 | It a kind of light intensity and polarizes atwirl light field and regulates and controls method |
| CN110515216B (en) * | 2019-07-19 | 2021-03-26 | 四川大学 | Light field regulation and control method for fast rotation of light intensity and polarization |
| CN113552718A (en) * | 2021-07-26 | 2021-10-26 | 南开大学 | Micro-nano structure processing method and system |
| CN113960813A (en) * | 2021-12-22 | 2022-01-21 | 苏州大学 | High-order poincare sphere polarization state generation method and system with robustness |
| CN114839788A (en) * | 2022-05-07 | 2022-08-02 | 浙江理工大学 | Light field center polarization state is along with distance regulation and control system |
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Application publication date: 20141008 |